Modification of mass formula by considering isospin effects

21
王王 王王王 王王王 ,, 王王王王 西 王王王王王王王王王王 Modification of mas s formula by consid ering isospin effec ts

description

Modification of mass formula by considering isospin effects. 王宁,刘敏,吴锡真 广西师范大学 中国原子能科学研究院. 壳模型预言的超重岛. Prof. Hofmann, GSI. {. Skyrme-Hartree-Fock (SHF). E shell [MeV]. 0 -3 -6 -9 -12. E shell for Various S el fc onsistent Calculations M. Bender, et al., GSI-Preprint 2001-09. - PowerPoint PPT Presentation

Transcript of Modification of mass formula by considering isospin effects

Page 1: Modification of mass formula by considering isospin effects

王宁,刘敏,吴锡真

广西师范大学中国原子能科学研究院

Modification of mass formula by considering isospin effects

Page 2: Modification of mass formula by considering isospin effects

壳模型预言的超重岛

Prof. Hofmann, GSI

Page 3: Modification of mass formula by considering isospin effects

114

114

126

126

172 172 172184 184184

120

120

Eshell[MeV]

0-3-6-9-12

{Skyrme-Hartree-Fock (SHF)Relativistic Mean Field (RMF)

Eshell for Various Selfconsistent CalculationsM. Bender, et al., GSI-Preprint 2001-09

1)超重岛的位置还需要进一步研究;

2)超重核壳修正的大小对于计算裂变位垒很重要;

Page 4: Modification of mass formula by considering isospin effects

宏观 - 微观方法

arXiv:nucl-th/1001.1493

Page 5: Modification of mass formula by considering isospin effects
Page 6: Modification of mass formula by considering isospin effects

同位旋依赖的电荷半径

假设单粒子势半径粗略地正比于电荷半径

Page 7: Modification of mass formula by considering isospin effects

微观壳修正

Page 8: Modification of mass formula by considering isospin effects

单粒子能级计算

Page 9: Modification of mass formula by considering isospin effects

单粒子势

Page 10: Modification of mass formula by considering isospin effects

对称势与对称能系数

Page 11: Modification of mass formula by considering isospin effects

原子核形变 (抛物线近似)

Page 12: Modification of mass formula by considering isospin effects
Page 13: Modification of mass formula by considering isospin effects

模型参数以及结果

2149 个核质量数据;1988 个中子分离能数据;

Page 14: Modification of mass formula by considering isospin effects

壳修正

Page 15: Modification of mass formula by considering isospin effects
Page 16: Modification of mass formula by considering isospin effects

超重岛位置

292114 附近的超重核的壳能量大约在 -(5~6) MeV

Page 17: Modification of mass formula by considering isospin effects

原子核的势能曲面 Eexp= -940.2MeV

Page 18: Modification of mass formula by considering isospin effects

可能的原子核形状共存

Eexp= -708.1MeV

A. Petrovici et al. / Prog. Part. Nucl. Phys. 43 (1999) 485

Page 19: Modification of mass formula by considering isospin effects

Eexp=1468.4MeV

郑世界 , 许甫荣 , 高能物理与核物理, 30 ( 2006 ) 121

刘艳鑫 , 于少英,沈彩万 , 董永胜,中国科学 G 辑, 39 ( 2009 ) 732

由于对形变能的抛物线近似有可能使得计算出来的基态形变不是非常准确,但是这些核的形状共存现象基本上还是能够再现

Woods-Saxon 推转壳模型 + Lipkin-Nogami(LN) 对力

Page 20: Modification of mass formula by considering isospin effects

重核以及超重核的势能曲面

Page 21: Modification of mass formula by considering isospin effects

结论

相对于 FRDM, 模型参数减少了一半;

2149 个核质量 rms 偏差减小了 14%, 达到 0.565MeV ;

超重岛的位置: N=178, Z=114 ;

超重核的壳修正能只有大约 -(5~6)MeV ;